Incidence ofSeptoria nodorumin Wheat Seed and Its Effects on Plant Growth and Grain Yield

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Abstract
S. nodorum was found in 98.5% of wheat seed samples in North Carolina [USA]. Infected seed gave rise to seedlings with infected coleoptiles, which resulted in significant reduction in seedling growth and grain yield. Pycnidia developed in diseased coleoptiles shortly after seed was planted in the fall and on the lower leaves in the spring. The fungus survived and remained virulent in stored seed for more than 2 yr. There was no correlation between percent seed infection and percent germination. Seed infected by S. nodorum could play an important role in epidemics of glume blotch.

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